2 line LCD display ADM1602T means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5x7 pixel matrix. This 2 line LCD display ADM1602T has two registers, namely, Command and Data. The command register stores the command instructions given to the LCD.

Features

1.5x8 dots

2.Built-in controller (ST7066 or equivalent)

3.+5V power supply (also available for =3.0V)

4.1/16 duty cycle

5.Easy interface with 4-bit or 8-bit MPU

6.Backlight optional

7.16x2 characters

Outline dimension

Absolute maximum ratings

Item

Symbol

Standard

Unit

Power voltage

VDD-VSS

-0.3

-

7.0

V

Input voltage

VIN

-0.3

-

VDD+0.3

Operating temperature range

Top

0

-

+50

℃

Storage temperature range

Tst

-10

-

+60

*Wide temperature range is available

(operating/storage temperature as –20~+70/-30~+80℃)

Block diagram

Interface pin description

Pin no.

Symbol

External connection

Function

1

VSS

Power supply

Signal ground for LCM (GND)

2

VDD

Power supply for logic for LCM

3

V0

Contrast adjust

4

RS

MPU

Register select signal

5

R/W

MPU

Read/write select signal

6

E

MPU

Operation (data read/write) enable signal

7~10

DB0~DB3

MPU

Four low order bi-directional three-state data bus lines.Used for data transfer between the MPU and the LCM.These four are not used during 4-bit operation.

11~14

DB4~DB7

MPU

Four high order bi-directional three-state data bus lines.Used for data transfer between the MPU

A

LED+

LED BKL power supply

Power supply for BKL (Anode)

K

LED-

Power supply for BKL (GND)

Contrast adjust

VDD~V0: LCD Driving voltage

VR: 10k~20k

Optical characteristics

STN type display module (Ta=25℃, VDD=5.0V)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Viewing angle

θ

Cr≥2

-60

-

35

deg

Φ

-40

-

40

Contrast ratio

Cr

-

8

-

-

Response time (rise)

Tr

-

-

200

250

ms

Response time (fall)

Tr

-

-

300

350

Electrical characteristics

DC characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Supply voltage for LCD

VDD-V0

Ta =25℃

-

4.5

-

V

Input voltage

VDD

4.7

-

5.5

Backlight supply voltage

VF

-

-

-

Supply current

IDD

Ta=25℃, VDD=5.0V

-

1.5

2.5

mA

Backlight supply current

IF

-

130

Input leakage current

ILKG

-

-

1.0

uA

“H” level input voltage

VIH

2.2

-

VDD

V

“L” level input voltage

VIL

Twice initial value or less

0

-

0.6

“H” level output voltage

VOH

LOH=-0.25mA

2.4

-

-

“L” level output voltage

VOL

LOH=1.6mA

-

-

0.4

Read cycle (Ta=25℃, VDD=5.0V)

Parameter

Symbol

Test pin

Min.

Typ.

Max.

Unit

Enable cycle time

tc

E

500

-

-

ns

Enable pulse width

tw

230

-

-

Enable rise/fall time

tr, tf

-

-

20

RS; R/W setup time

tsu

RS; R/W

40

-

-

RS; R/W address hold time

th

10

-

-

Data output delay

td

DB0~DB7

-

-

120

Data hold time

tdh

5

-

-

Write cycle (Ta=25℃, VDD=5.0V)

Parameter

Symbol

Test pin

Min.

Typ.

Max.

Unit

Enable cycle time

tc

E

500

-

-

ns

Enable pulse width

tw

230

-

-

Enable rise/fall time

tr, tf

-

-

20

RS; R/W setup time

tsu1

RS; R/W

40

-

-

RS; R/W address hold time

th1

10

-

-

Data output delay

tsu2

DB0~DB7

80

-

-

Data hold time

th2

10

-

-

FAQ:

1.What is a LED backlight ?

A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light by themselves (unlike, for example cathode ray tube (CRT) displays), they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel, unlike frontlights, which are placed in front of the LCD. Backlights are used in small displays to increase readability in low light conditions such as in wristwatches,[1] and are used in smart phones, computer displays and LCD televisions to produce light in a manner similar to a CRT display.

2. What is RGB LEDs?

RGB LEDs can deliver an enormous color gamut to screens[5]. When using three separate LEDs (additive color) the backlight can produce a color spectrum that closely matches the color filters in the LCD pixels themselves. In this way, the filter passband can be narrowed so that each color component lets only a very narrow band of spectrum through the LCD. This improves the efficiency of the display since less light is blocked when white is displayed. Also, the actual red, green, and blue points can be moved farther out so that the display is capable of reproducing more vivid colors.

3.What is backlight dimming ?

LED backlight are often dynamically controlled using the video information[14] (dynamic backlight control or dynamic “local dimming” LED backlight, also marketed as HDR, high dynamic range television, invented by Philips researchers Douglas Stanton, Martinus Stroomer and Adrianus de Vaan[15][16][17]).

Using PWM (pulse-width modulation, a technology where the intensity of the LEDs are kept constant, but the brightness adjustment is achieved by varying a time interval of flashing these constant light intensity light sources[18]), the backlight is dimmed to the brightest color that appears on the screen while simultaneously boosting the LCD contrast to the maximum achievable levels

If the frequency of the pulse-width modulation is too low or the user is very sensitive to flicker, this may cause discomfort and eye-strain, similar to the flicker of CRT displays.[19][20] This can be tested by a user simply by waving a hand or object in front of the screen. If the object appears to have sharply defined edges as it moves, the backlight is strobing on and off at a fairly low frequency. If the object appears blurry, the display either has a continuously illuminated backlight or is operating the backlight at a frequency higher than the brain can perceive. The flicker can be reduced or eliminated by setting the display to full brightness, though this may have a negative impact on image quality and battery life due to increased power consumption.